/**
 * mescroll-body写在子组件时,需通过mescroll的mixins补充子组件缺少的生命周期
 */
const MescrollCompMixin = {
  // 因为子组件无onPageScroll和onReachBottom的页面生命周期，需在页面传递进到子组件 (一级)
  onPageScroll(e) {
    this.handlePageScroll(e)
  },
  onReachBottom() {
    this.handleReachBottom()
  },
  // 当down的native: true时, 还需传递此方法进到子组件
  onPullDownRefresh() {
    this.handlePullDownRefresh()
  },
  data() {
    return {
      mescroll: {
        // mescroll-body写在子子子...组件的情况 (多级)
        onPageScroll: (e) => {
          this.handlePageScroll(e)
        },
        onReachBottom: () => {
          this.handleReachBottom()
        },
        onPullDownRefresh: () => {
          this.handlePullDownRefresh()
        }
      }
    }
  },
  methods: {
    handlePageScroll(e) {
      let item = this.$refs['mescrollItem']
      if (item && item.mescroll) item.mescroll.onPageScroll(e)
    },
    handleReachBottom() {
      let item = this.$refs['mescrollItem']
      if (item && item.mescroll) item.mescroll.onReachBottom()
    },
    handlePullDownRefresh() {
      let item = this.$refs['mescrollItem']
      if (item && item.mescroll) item.mescroll.onPullDownRefresh()
    }
  }
}

export default MescrollCompMixin
